The Lecture Notes of Dr. R. D. Field
http://www.phys.ufl.edu/~rfield/PHY3063/The online physics course notes for Physics 3063, by Professor Rick Field, University of Florida, is a good summary of many of the useful formulas used in special relativity.
Submitted in section: Physics: Relativity: Special Relativity: The Lecture Notes of Dr. R. D. Field